Billy roll



C. J. KLEIN May 9, 194:4.

r in themselves new.

Patented May 9, 1944 BILLY ROLL Clarence J. Klein, Marian signer to National Steel tion of Delaware 6 Heights, W. Va as- Corporation, a corpora- Application December 22, 1941, Serial No. 424,065

6 Claims.

This invention relates to improvements in billy rolls for cold rolling mills.

Billy rolls used with cold rolling mills are not These rolls are idler rolls which press the strip being rolled out of the pass line against the periphery of the work 1011 on a line along the surface of the work roll on its entrance side. The action of the nip of the work rolls pulling on the strip against back tension and the action of the billy roll pressing the strip against the work roll along a line results in a strip being pressed against the surface of the roll between this last named line and the nip of the work rolls. The billy roll need not actually press the strip against the work roll since if the surface of the billy roll is sufficiently above the pass line of the strip, the strip after passing over the billy roll will be held against a portion of the surface of the work roll adjacent the nip of the work rolls. By thus holding an area of the strip in contact with the work roll, strip having buckles in the-central portion or ruiiled edges is prevented from cobbling in the mill. This same action tends to prevent the strip from feeding at an angle into the work rolls or working off to one side or the other of the mill stand.

Billy rolls in prior use were either fixed in operative position relative to the work rolls or were moved toward and away from the work rolls by complicated and manually operated mechanism. In modern strip rolling the speed of rolling is economically important. .Each new coil must be brought into position, fed into the nip of the work rolls and the rolling actionbrought up to speed as quickly as possible. With billy rolls of the prior art, either the rolling action had to be delayed to thread the strip through the billy roll and work rolls or if the billy roll were moved back the time required to bring it up into position caused a loss of rolling time.

The mill could not be brought up to speed quickly without the billy roll being in place because most buckles and milled edges appear in the initial portion .of. the strip. To make possible easy threading of the strip into the mill and at the same time an immediate speed-up of the mill to operating speed. the applicant has devised an improved billy roll mounting structure. Besides being capable of ready movement into and out of operating position, the billy roll of the present invention is resiliently pressed into operative position by the moving mechanism.

The specific embodiments disclosed herein are shown applied to stands of a temper mill like the bell crank. A bar that disclosed in United States Patent No. 2,287,380, although it is to be understood that the present invention is applicable to any continuous cold mill.

An important object of the present invention is to provide an improved billy roll capable of rapid movement into and out of operative position in a mill stand.

A further important object of the present invention is the proyision of a billy roll having resilient coaction with the strip when in operative position.

These and other objects and advantages of the present invention will be. apparent in the following specification and accompanying drawing which describe and illustrate preferred embodi- Inents of the present invention.

Figure 1 is a view in side elevation of a structure embodying the present invention; l

Fi ure 2 is a view fication embodying Referring to the the present invention.

embodiment shown in Figure 1 the work rolls of a mill stand for cold rolling strip are shown at l0, l0. These work rolls are backed up by backing rolls I2, l2 to form the usual 4-high mill. A portion of the mill stand frame is shown at I3; The strip to be rolled is shown at H, subject to tension by meansnot shown and passing over billy roll I 5 into the nip of work rolls Ill and II. Each end of idler roll [5 is carriedby a carrierslidebar I6 which in turn is slidably carried in a trackway ll rigidly mounted on the frame of the mill stand l3. Trackway l1 carries abutments l8 and I 9. Mounted on carrier slidebar I6 is a projection 20 which contacts abutments l8 and IS in the limiting positions of the carrier slide bar. Pivotallymounted on projection 20 is a link 2! which in turn is pivotally connected to a bell crank 22 which latter is rotatably mounted at 23 on the mill stand frame l3. operating mechanism 25 has connection at 24 with the other end of bell crank 22 so that movement of the piston in the air cylinder 25 through bell crank 22 and link 2| moves carrier slide bar l6 and thus billy roll l5 into and out of operative position. The cylinder has pivotal connection with the frame of the mill stand to operate 25 connects projections 20 on each carrier slide bar to form the same into a rigid carriage. 1

Referring to Figure 2 a pair of work rolls are shown at 21, 21, a strip to be'rolled at 29 and a billy roll in operative of the mill stand frame is shown at 28. Billy in side elevation-of a modi- The air cylinder position at 30. A portion.

roll 30 is carried by a carriage 3| mounted on into operative position,

mill in which four wheels 32. The two wheels on each side of the carriage run in trackway 33 rigidly mounted on the mill stand frame 28. An abutment 34 limits movement of carriage 3| away from the work rolls. On one side of the carriage there is mounted a lug 35 which connects with the operating member 36 of an air cylinder 31. Movement of the piston of the air cylinder moves carriage 3| between a position defined by stop 34 and in the other direction that defined by the length of the cylinder or the tension of the strip. A linkage system 38 is connected to each side of the carriage and a shaft 39 rotatively mounted on the mill stand frame 28 connects the two linkage systems to maintain the carriage movement in a straight line.

In either of the above two modifications by operating an air valve the mill stand operator can move the billy roll into and out of operative position. In inoperative position the idler roll may or may not hold the strip out of the pass line (shown in broken lines in both figures) but inoperative position the strip must be held at an angle to the pass line between the idler roll and the work rolls to accomplish its purpose. The inoperative position is designed to allow the operator suflicient room to start the strip into the mill stand. When the strip is threaded into the nip of the Work rolls the mill is started and practically simultaneously the billy roll is .moved thereby preventing cobbling at the time when it is most likely to take place. By moving the billy roll in either modification to a position intermediate the operative and inoperative position, the pressure of the air cylinders acting against the tension of the strip will serve to reduce flutter in the strip when this tends to occur due to a flattened coil.

I claim:

1; A billy roll arrangement for a cold rolling mill in which a metal strip to be reduced is passed under back tension between the work rolls of a mill stand, the combination comprising guide means on the entrance side of the mill stand. carriage means movably associated with the guide means so as to have straight line movement toward and away from one of the work rolls, a major component of said straight line movement being parallel to the pass line, and anidler roll carried by the carriage means and movable thereby between operative and inoperative positions, the idler roll in operative position being not farther from said one work roll than a distance equal to the diameter of the idler roll and engaging the tensional strip to feed the same to the work rolls at an angle to the pass line.

2. A billy roll arrangement for a cold rolling a metal strip to be reduced is passed under back tension between the work rolls of a one of said work rolls than a the work rolls at an angle to the pass line, and power means for moving the carriage.

3. A billy roll arrangement for a cold rollin mill in which a metal strip to be reduced is passed under back tension between the work rolls of a mill stand, the combination comprising guide means on the entrance side of the mill stand, carriage means movably associated with the guide means so as to have straight line movement toward and away from one of the work rolls, a major component of said straight line movement being parallel to the pass line, an idler roll carried by the carriagemeans and movable thereby between operative and inoperative positions, the idler roll in operative position being not farther from said one work roll than a distance equal to the diameter of the idler roll and engaging the tensioned strip to feed the same to the work rolls at an angle to the pass line, and compressible fluid operated power means connected to the carriage for urging the idler roll toward operative position.

4. A billy roll arrangement fora cold rollin mill in which a metal strip to be reduced is passed under back tension between the work rolls of a mill stand, the combination comprising a trackway on the entrance side of the mill stand, carriage means movably mounted on the trackway so as to have movement toward and away from the work rolls, and an idler roll carried by the carriage means and movable thereby between operative and inoperative positions, the idler roll in operative position being not farther from distance equal to the diameter of said work roll and engaging the strip to feed the same to the work rolls at an angle to the pass line.

5. A billy roll arrangement for a cold rolling mill in which a metal strip to be reduced is passed under back tension between the work rolls of a mill stand, the combination comprising a trackway on the entrance side of the mill stand, carriage means movably mounted on the track way so as to have movement toward and away from the work rolls, an idler roll carried by the carriage means and movable thereby between mill stand, the combination comprising guide means on the entrance side of the .mill stand, carriage means movably associated with the guide means so as to have straight line movement toward and away rolls, a major component of said straight line movement being parallel to the pass line, an idler roll carried by the carriage means and movable thereby between operative and inoperative positions, the idler roll in operative position being not farther from said one work roll than a distance equal to the diameter of the idler roll and engaging the tensioned strip to feed the same to from one of the work operative and inoperative positions, the idler roll in operative position being not farther from one of said work rolls than a distance equal to the diameter of said work roll and engaging the strip to feed the same to the work rolls at an angle to the pass line, and remotely controlled power means for moving the carriage.

6. A billy roll arrangement for a cold rolling mill in which a metal strip to be reduced is passed under back tension between the work rolls of a mill stand, the combination comprising a trackway on the entrance side of the mill stand. carriage means movably mounted on the track way so as to have movement toward and away from the work rolls, an idler roll carried by the carriage means and movable thereby between operative and inoperative positions, the idler roll in operative position being not farther from one of said work rolls than a distance equal to the diameter of said work roll and engaging the strip to feed the same to the work rolls at an angle to the pass line, and compressible fluid operated power means connected to the carriage for urging the idler roll toward operative position.

CLARENCE J. KLEIN. 

